I’m surprised how quickly they started doing this. Couldn’t weather the protest for even two days.

You’re actually posting in a community on a different instance than yours right now.

To answer your question one surefire way to find a community on another instance is to paste it into the search bar. There are other ways you can discover a community dynamically. E.g. !lemmyarchivists@lemmy.dbzer0.com. If you’re not logged in to the instance with the community you may see instructions on the sidebar for this.

The /r/piracy subreddit is already blacked out and directing to https://lemmy.dbzer0.com/c/piracy. I don’t know the history of that instance but it seems to be mostly piracy-focused communities. Could be what you’re talking about has happened already.